1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 2a86fe353SMasahiro Yamada# ========================================================================== 3a86fe353SMasahiro Yamada# 4a86fe353SMasahiro Yamada# make W=... settings 5a86fe353SMasahiro Yamada# 6a86fe353SMasahiro Yamada# W=1 - warnings that may be relevant and does not occur too often 7a86fe353SMasahiro Yamada# W=2 - warnings that occur quite often but may still be relevant 8a86fe353SMasahiro Yamada# W=3 - the more obscure warnings, can most likely be ignored 9a86fe353SMasahiro Yamada# 10a86fe353SMasahiro Yamada# $(call cc-option, -W...) handles gcc -W.. options which 11a86fe353SMasahiro Yamada# are not supported by all versions of the compiler 12a86fe353SMasahiro Yamada# ========================================================================== 13a86fe353SMasahiro Yamada 14321cb030SXiongfeng WangKBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) 15321cb030SXiongfeng Wang 16a86fe353SMasahiro Yamadaifeq ("$(origin W)", "command line") 17a86fe353SMasahiro Yamada export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W) 18a86fe353SMasahiro Yamadaendif 19a86fe353SMasahiro Yamada 20a86fe353SMasahiro Yamadaifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS 21a86fe353SMasahiro Yamadawarning- := $(empty) 22a86fe353SMasahiro Yamada 23a86fe353SMasahiro Yamadawarning-1 := -Wextra -Wunused -Wno-unused-parameter 24a86fe353SMasahiro Yamadawarning-1 += -Wmissing-declarations 25a86fe353SMasahiro Yamadawarning-1 += -Wmissing-format-attribute 26*4c8dd95aSMasahiro Yamadawarning-1 += -Wmissing-prototypes 27a86fe353SMasahiro Yamadawarning-1 += -Wold-style-definition 28*4c8dd95aSMasahiro Yamadawarning-1 += -Wmissing-include-dirs 29a86fe353SMasahiro Yamadawarning-1 += $(call cc-option, -Wunused-but-set-variable) 30c9c6837dSArnd Bergmannwarning-1 += $(call cc-option, -Wunused-const-variable) 31321cb030SXiongfeng Wangwarning-1 += $(call cc-option, -Wpacked-not-aligned) 3223066c3fSMiguel Ojedawarning-1 += $(call cc-option, -Wstringop-truncation) 33*4c8dd95aSMasahiro Yamada# The following turn off the warnings enabled by -Wextra 34*4c8dd95aSMasahiro Yamadawarning-1 += -Wno-missing-field-initializers 35*4c8dd95aSMasahiro Yamadawarning-1 += -Wno-sign-compare 36a86fe353SMasahiro Yamada 37a86fe353SMasahiro Yamadawarning-2 := -Waggregate-return 38a86fe353SMasahiro Yamadawarning-2 += -Wcast-align 39a86fe353SMasahiro Yamadawarning-2 += -Wdisabled-optimization 40a86fe353SMasahiro Yamadawarning-2 += -Wnested-externs 41a86fe353SMasahiro Yamadawarning-2 += -Wshadow 42a86fe353SMasahiro Yamadawarning-2 += $(call cc-option, -Wlogical-op) 43*4c8dd95aSMasahiro Yamadawarning-2 += -Wmissing-field-initializers 44*4c8dd95aSMasahiro Yamadawarning-2 += -Wsign-compare 45a76bcf55SArnd Bergmannwarning-2 += $(call cc-option, -Wmaybe-uninitialized) 46de8cf950SJohannes Thumshirnwarning-2 += $(call cc-option, -Wunused-macros) 47a86fe353SMasahiro Yamada 48a86fe353SMasahiro Yamadawarning-3 := -Wbad-function-cast 49a86fe353SMasahiro Yamadawarning-3 += -Wcast-qual 50a86fe353SMasahiro Yamadawarning-3 += -Wconversion 51a86fe353SMasahiro Yamadawarning-3 += -Wpacked 52a86fe353SMasahiro Yamadawarning-3 += -Wpadded 53a86fe353SMasahiro Yamadawarning-3 += -Wpointer-arith 54a86fe353SMasahiro Yamadawarning-3 += -Wredundant-decls 55a86fe353SMasahiro Yamadawarning-3 += -Wswitch-default 56a86fe353SMasahiro Yamadawarning-3 += $(call cc-option, -Wpacked-bitfield-compat) 57a86fe353SMasahiro Yamada 58a86fe353SMasahiro Yamadawarning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 59a86fe353SMasahiro Yamadawarning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 60a86fe353SMasahiro Yamadawarning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS))) 61a86fe353SMasahiro Yamada 62a86fe353SMasahiro Yamadaifeq ("$(strip $(warning))","") 63a86fe353SMasahiro Yamada $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown) 64a86fe353SMasahiro Yamadaendif 65a86fe353SMasahiro Yamada 66a86fe353SMasahiro YamadaKBUILD_CFLAGS += $(warning) 6726ea6bb1SBehan Websterelse 6826ea6bb1SBehan Webster 69076f421dSMasahiro Yamadaifdef CONFIG_CC_IS_CLANG 7026ea6bb1SBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides) 7126ea6bb1SBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, unused-value) 7226ea6bb1SBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, format) 7326ea6bb1SBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, sign-compare) 7426ea6bb1SBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) 7526ea6bb1SBehan WebsterKBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) 7626ea6bb1SBehan Websterendif 77a86fe353SMasahiro Yamadaendif 78